Presentation on theme: "Starter Motors."— Presentation transcript:
Damage to the electrical windings is usually too difficult to deal with at home. An auto-electrician can cure a minor short circuit in the field coils, but anything else calls for fitting a new or exchange motor.
Bosch Starter Motor
Since our very inception in 1996, Power Point has become a well-known firm involved in Authorized Wholesale Dealing and service providing of Electric UPS, Automobile Battery, Electrical Inverters, Starter Motor Repairing Services etc. These products are highly appreciated for their hassle free performance, efficient functioning, sturdy design and longer service life. The entire range is quality tested on various parameters prior to its final shipping to ensure its authenticity. These are safely packed in the best packaging material to avoid any flaws.
Starter Motor Repair
Remove any corrosion with wet and dry sand paper, and the commutator can be sanded and the back of a box cutter knife can be used to clean out between the segments. The insulation between the segments should be under cut to work correctly. Than an oily rag is used to wipe everything to help prevent any future corrosion.
In technical terms, a soft starter is any device which reduces the torque applied to the electric motor. It generally consists of solid state devices like thyristors to control the application of supply voltage to the motor. The starter works on the fact that the torque is proportional to the square of the starting current, which in turn is proportional to the applied voltage. Thus the torque and the current can be adjusted by reducing the voltage at the time of starting the motor.
Why are synchronous motors not self starting?
In negative half cycle, stator poles interchange their position ( in 10 msec – 50 Hz frequency assumed ) but rotor poles can’t rotate as they have inertia and friction. As this time (10 msec) is too small to respond for the torque. Hence in negative cycle, stator poles changed but rotor poles remains same, now force exerted on rotor is in opposite direction. Torque is given as ‘+T’ (positive for clockwise torque)
Why single phase induction motor is not self starting?
When AC current passes through the stator three phase winding 3 fluxes are generated with same magnitude but 120 degree phase difference between them. Thus, the resultant flux due to 3 fluxes is a rotating one and this can be proved by mathematical vector analysis too. This rotating resultant flux rotates unidirectionally and links with the rotor coil which to oppose this effect starts rotating in same direction.
Less CO2, less fuel and less expense – automatically and without having to change driving style? Bosch have the answer. A technically sophisticated, highly effective solution: The start-stop system.
Construction of 3 Point Starter
Most induction motors are started directly on line, but when very large motors are started that way, they cause a disturbance of voltage on the supply lines due to large starting current surges.